CECS 277
LAB ASSIGNMENT 7
Assigned date: 11/27
Due date: 12/6
40 points

1. Visitor pattern
Design a ordering system application.

The customer can order the following items:

• laptop computers
  20% discount if the labtop is the Microsoft Surface
• Mobil phones
  Apple phone
  Apply $30 discount If the price is greater than $400.00
  Samsung phone
  Apply 20% discount if the phone is Galaxy S8
• Video game
  Sony-Playstation - 20% discount
  30% discount for buying two Microsoft Xbox One consoles.

Write a main method that accepts the customer orders, displays the orders and the total cost of all the orders.

2. Decorator pattern
Design a simple pizza and use three different types of toppings (pepperoni, sausage, and extra cheese) in any order the customers wants.

3. State pattern

• A robot has a life and its life has two states i.e .happy and boring.
  • If the robot is happy, the he talks and cooks.
  • If the robot is boring, then he sings, and then he goes in happy state again.
• Write a main program to test the robot's states.

4. Command pattern
//class Stock

public class Stock {

    private String name;
    private double price;

    public Product(String name, double price) {
        this.name = name;
        this.price = price;
    }

    public void buy(int quantity){
        System.out.println(“BOUGHT: “ + quantity + “x “ + this);
    }

    public void sell(int quantity){
        System.out.println(“SOLD: “ + quantity + “x “ + this);
    }

    public String toString() {
        return “Product [name=” + name + “, price=” + price + “]”;
    }

}

a. Create two command classes that allows the customer to buy and sold stocks.
b. Write a main method to test it.

5. Adapter pattern
//interface NameInterface
interface NameInterface {
public void setName(String n);

public String getName();
}

//Adaptee class
class SimpleName implements NameInterface {
String name;

public void setName(String n) {
name = n;
}

public String getName() {
return name;
}
}

//Target interface
interface FullNameInterface {
public void setFirstName(String f);

public void setLastName(String l);

public String getFirstName();

public String getLastName();
}

a. Create an adapter to convert the interface NameInterface to FullNameInterface
b. Write a main method test the adapter.

6. Memento pattern

Design a simple calculator that allows to restores the previous additon operation of two numbers.